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October 5, 2022 by dev

Fail2Ban

  • How To Protect SSH with Fail2Ban on Debian 11

Check whether installed.

systemctl status fail2ban

Installed, but fail2ban not active or running

systemctl start fail2ban
systemctl enable fail2ban

To fail2ban error fix

fail2ban-client start

Installing Fail2ban, if not installed

sudo apt update
sudo apt install fail2ban

Check installation status

systemctl status fail2ban.service

Configuring Fail2ban

Configuration files of fail2ban service is in the /etc/fail2ban directory. There is a file with defaults called jail.conf. In this tutorial, you’ll create jail.local by copying jail.conf

cd /etc/fail2ban
sudo cp jail.conf jail.local

Now you can configure as per requirements

sudo vi jail.local

You can set bantime, findtime, maxretry and you can set destemail to receive email alert.

Individual Jail Settings

vi /etc/fail2ban/jail.local

By default, the SSH service is enabled and all others are disabled.

enabled = true

After configuring all restart

sudo systemctl restart fail2ban

Ignore IP

ignoreip

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Filed Under: Debian, iRedMain, Mail Server Solusion

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